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package org.apache.doris.nereids.rules.exploration;

import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.trees.plans.JoinType;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.logical.LogicalJoin;

/**
 * Rule factory for change inner join left associative to right.
 */
public class JoinAssociativeLeftToRight extends OneExplorationRuleFactory {
    @Override
    public Rule<Plan> build() {
        return innerLogicalJoin(innerLogicalJoin(), any()).then(root -> {
            // fixme, just for example now
            return new LogicalJoin(
                    JoinType.INNER_JOIN,
                    root.getOnClause(),
                    root.left().left(),
                    new LogicalJoin(
                            JoinType.INNER_JOIN,
                            root.getOnClause(),
                            root.left().right(),
                            root.right()
                    )
            );
        }).toRule(RuleType.LOGICAL_JOIN_ASSOCIATIVE_LEFT_TO_RIGHT);
    }
}
